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Understanding the Performance and Applicability of Low Impact Development Structures under Varying Infiltration Rates
KSCE Journal of Civil Engineering ( IF 1.9 ) Pub Date : 2020-04-07 , DOI: 10.1007/s12205-020-2274-5
Heidi B. Guerra , Youngchul Kim

With the increasing effect of urbanization becoming more apparent through flooding and decline in downstream water quality especially from heavy rainfalls, stormwater runoff management solutions have focused on treatment and infiltration. However, there are areas with low infiltration soils or are experiencing more dry days and even drought. In this study, experiments were conducted to compare the applicability of high infiltration and low infiltration soils as a base layer in gravel-filled infiltration systems with emphasis on runoff capture and suspended solids removal. Findings showed that infiltration rates increased with the water depth above the gravel-soil interface indicating the available depth for water storage affects this parameter. Runoff capture in high infiltration systems are more affected by rainfall depth and inflow rates as compared to low infiltration systems. Based on runoff capture and pollutant removal analysis, a media depth of 0.4 − 1 m and maximum infiltration rate of 200 mm/h were recommended. Moreover, it was revealed that low infiltration systems are more susceptible to horizontal flow and that the length of the structure may be more critical than depth in this condition.



中文翻译:

了解不同渗透率下低影响开发结构的性能和适用性

随着洪水和下游水质的下降(尤其是大雨)导致城市化进程的日益明显,雨水径流管理解决方案的重点已放在处理和渗透上。但是,有些地区土壤渗透率低,或者干燥天数甚至干旱。在这项研究中,进行了实验以比较高渗透和低渗透土壤作为砾石充填渗透系统的基础层的适用性,重点是径流捕获和悬浮物去除。研究结果表明,渗透率随砾石-土壤界面上方水深的增加而增加,表明可用的储水深度影响了该参数。与低渗透系统相比,高渗透系统中的径流捕获受降雨深度和入流率的影响更大。基于径流捕获和污染物去除分析,建议介质深度为0.4 − 1 m,最大渗透速率为200 mm / h。而且,已经揭示出低渗透系统更容易受到水平流动的影响,在这种情况下,结构的长度可能比深度更关键。

更新日期:2020-04-18
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